What it means
The module reports that a driver inducement for the NOx control system is active. It sets the code when an emissions system fault has triggered a driver warning or operating restriction, according to the vehicle's strategy.
How it works
The NOx control system uses components such as NOx sensors, the SCR catalyst, reductant delivery, and sometimes EGR to limit emissions. This code records that the vehicle's emissions strategy has activated a driver warning or restriction after detecting a related fault; it does not identify the underlying failed component.
Common causes
Most likely first.
- NOx sensor or wiring fault
- SCR catalyst efficiency problem
- Reductant quality or delivery fault
- EGR system fault
- Unresolved emissions system trouble code
Symptoms
- NOx or emissions warning
- AdBlue warning
- Reduced engine power
- Starting restriction countdown
How to diagnose it
- Read all stored, pending, and permanent codes and note freeze-frame data to find the emissions fault that triggered the inducement.
- Check the dashboard message and scan-tool data for an AdBlue warning, remaining countdown, or stated operating restriction.
- Inspect NOx sensor connectors and wiring for damage, corrosion, or disconnection.
- Check reductant level and any quality or delivery data available on the scan tool, following the vehicle's service information.
- Diagnose the underlying NOx, SCR, EGR, or reductant codes before clearing the inducement status.
Common fixes
- Correct the underlying emissions fault identified by companion codes.
- Repair damaged NOx sensor wiring or connectors.
- Restore reductant supply or delivery if testing confirms a fault.
- Replace a NOx sensor or address SCR catalyst efficiency only after the relevant tests confirm the fault.
Can I keep driving?
Follow the vehicle's warning and countdown messages; some vehicles may limit power or prevent restarting when the countdown expires. Avoid relying on the vehicle for a trip that could leave you unable to restart.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.